Compiling a kernel on a PPC machine

DebianPlanet: "I never ran into much trouble when compiling a Linux Kernel on my PC (using make menuconfig, make
install, make modules, make modules_install etc etc), but every time I try to compile a kernel (2.4.x) on
a PPC machine (I tried on those three : PowerMac 7300, G3/266, and G4 Cube 450), it just won't work!"